Feasibility of recycling concrete construction waste in environmental and economic sides

Abstract

n light of the conditions experienced by Syria and due to the destruction and demolition of its buildings built up rubble and occupied a large area of its territory. Therefore, it was necessary to develop an appropriate strategy to study these debris and provide the ideal solutions to be able to benefit from them as much as possible and thus mitigate the harmful impact on the environment and the surrounding environment. The work is divided into two parts: First: The study focuses  on one of the mechanisms of benefiting from  the recycled aggregate by using them in producing concrete, after studying their characteristics(Sieve Analysis-density- Absorption) and then mixing them with natural aggregate as replacement of natural coarse aggregate at different rates(15-30-45-75-100)%. Six concrete cubes were made for each mixture and 3 cubes were broken after 7 days and the other after 28 days . it was concluded The relationship between the percentage of recycled aggregates and compressive strength, as well as the relationship between the percentage of stones and the rate of Absorption The results showed that the acceptable percentage of replacement of natural aggregates with recycled aggregates may reach 100% with the recording of values of resistance of up to 21.9Mpa  . Second :The environmental and economic feasibility of using recycled aggregates has been studied the results showed that use 75% of the recycled aggregates in structural concrete works will reduce energy consumption and carbon dioxide emissions by 28% and 33%, respectively, and the economic saving rate is 63.71%. .   Through this study two objectives can be achieved:  First: removing large quantities of environmental pollution sources resulting from these wastes and thus achieving an environmental goal. Second: Provide other sources of concrete aggregates and thus protect the natural quarries and achieve an economic goal.